fix hijack logger middleware

Signed-off-by: Emile Vauge <emile@vauge.com>

middlewares/logger.go

@@ -1,6 +1,7 @@
 package middlewares
 
 import (
+	"bufio"
 	"fmt"
 	log "github.com/Sirupsen/logrus"
 	"github.com/streamrail/concurrent-map"
@@ -167,6 +168,10 @@ func (lirw *logInfoResponseWriter) Flush() {
 	}
 }
 
+func (lirw *logInfoResponseWriter) Hijack() (net.Conn, *bufio.ReadWriter, error) {
+	return lirw.rw.(http.Hijacker).Hijack()
+}
+
 func (lirw *logInfoResponseWriter) GetStatus() int {
 	return lirw.status
 }